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  4. The relative density of lead is 11.3. Its density in SI unit is

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Q. The relative density of lead is $11.3$. Its density in $SI$ unit is

Physical World, Units and Measurements

Solution:

Relative density $=\frac{\text{Density of a substance}}{\text{Density of water}}$
$\therefore $ Density of lead $=11.3 \times1 \times10^{3}\,kg\,m^{-3}$
($\because$ Density of water $= 1 \times 10^3 \,kg\, m^{-3}$)
$= 11.3 \times 10^3\, kg\, m^{-3}= 1.13 \times 10^4\,kg\, m^{-3}$